The entire statement is in fact a falsehood, as Amazon does not embody that idea, regardless of its veracity. Amazon has never paid a dividend, and is guided as much or more by the pursuit of growth (and also "customer value" although unevenly) that simply maximising shareholder value.
You don't need to pay dividends to maximize shareholder value. As you correctly point out Amazon prioritizes growth over dividends, but also with the goal of maximizing shareholder value (business is bigger/more stable/etc. -> value of shares goes up).
